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Listing 1 . A text version of Hello World.
class TextHelloWorld{ public static void main(String[]args){ System.out.println("Text Hello World");}//end main }//end class

As mentioned above, this program does not require the use of Ericson's library. It can be compiled and executed using a batch file containing thecommands shown in Figure 5 . You should make certain that you can compile and execute this program before progressing to the graphicversion.

Note that this batch file must be placed in the same folder that contains the file named TextHelloWorld.java , and that folder must be your "current directory."

Also note that the term "-cp . " (note the space followed by a period) is probablysuperfluous on most computers. According to PATH and CLASSPATH , "The default value of the classpath is "." (note the period), meaning that ..."

Therefore, it should not be necessary to specify the classpath as "-cp . " to compile and execute the program on mostcomputers. However, on 09/10/14, I encountered a student's computer that did notcomply with the default described above and this prevented the student from being able to compile and execute the program. Including "-cp . " in the javac and java commands doesn't cause any harm. Therefore, I have updated the batch file commands shown in Figure 5 to include it. You can omit it if your computer doesn't need it.

Figure 5 . Batch file for text version of Hello World.
echo off del *.classjavac -cp . TextHelloWorld.java java -cp . TextHelloWorldpause

A graphic version of Hello World

Listing 2 contains the code for a graphic version of Hello World.

Listing 2 . A graphic version of Hello World.
import java.awt.Color; class GraphicHelloWorld{public static void main(String[] args){Picture pix = new Picture(200,100); pix.setAllPixelsToAColor(Color.RED);pix.addMessage("Graphic Hello World",15,50); pix.show();}// end main }//end class

The program shown in Listing 2 causes the image shown in Figure 6 to be displayed when the program is compiled andexecuted.

Figure 6 - Hello World in graphics.

A graphic image with the text Hello World

As mentioned above, this program does require the use of Ericson's library. It can be compiled and executed using a batch file containing thecommands shown in Figure 7 . You should make certain that you can compile and execute this program before progressing to morecomplex programs involving Ericson's library.

Note that this batch file must be placed in the same folder that contains the file named GraphicHelloWorld.java , and that folder must be your "current directory."

Figure 7 . Batch file for graphic version of Hello World. .
echo off del *.classjavac -cp .;M:\bookClasses GraphicHelloWorld.java java -cp .;M:\bookClasses GraphicHelloWorldpause

Once again, the commands shown in Figure 7 assume that the bookClasses folder is in the root directory on the M-drive. The bookClasses folder will likely be in a different location on your computer.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: The Guzdial-Ericson Multimedia Class Library
  • File: Java3000.htm
  • Published: 07/27/12
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.

In the past, unknown individuals have misappropriated copies of my modules from cnx.org, converted them to Kindle books, andplaced them for sale on Amazon.com showing me as the author. I receive no compensation for those sales and don't know who doesreceive compensation. If you purchase such a book, please be aware that it is a bootleg copy of a module that is freelyavailable on cnx.org.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
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many many of nanotubes
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I'm interested in nanotube
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preparation of nanomaterial
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how to synthesize TiO2 nanoparticles by chemical methods
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